These guards, however flimsy on many of today's cars, help keep water and winter's salty slush from splashing up into the engine compartment, where it can damage sensitive electrical components. Unfortunately, these guards tear off easily, sometimes without the driver knowing it. Check for damage to these guards when you wash your car. Re-secure with the appropriate fasteners or replace as needed. As added protection from splashed-up muck, slush, and debris, install mud flaps (also called splash guards) on your vehicle.